Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 302249818b57498e2906b0cd8137d8ed5014b0132793f74966e89e34c495f657:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16